asp.net code 128 barcode State management in .NET

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One of ASP.NET s strong points is state management. ASP.NET has excellent support for caching, cookies, and user sessions. In ASP.NET MVC we can leverage these as we have in the past. State management refers to the storage and retrieval of state. As we all know, the web is a stateless environment, so special techniques have to be used to retain data about the user s current state and recent activity. Session state and cookie storage address these concerns. Sometimes it s helpful to store per-user data that lives only for a single web request, and request storage is useful in these scenarios. Frequent trips to a backend data store can yield horrible performance under heavy loads. ASP.NET s built-in support for caching can help keep a popular application running efficiently. We ll examine the ASP.NET cache first.
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Caching is immensely important in today s web applications. A website of significant size or traffic can drastically reduce the amount of database access by effective use of caching. With ASP.NET we can also cache rendered HTML, which saves CPU resources on the server. Done properly, it s one of the best tools for coping with severe loads. Done poorly, your efforts will be detrimental to your website s performance.
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Caching tips and strategies are out of the scope of this book. Correctly applying caching strategies can be critical to website performance. We ll cover how caching is applied in ASP.NET MVC, but if you want to read more about advanced caching, see Professional ASP.NET 4 in C# and VB by Bill Evjen, Scott Hanselman, and Devin Rader.
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In an ASP.NET application, caching frequently accessed sets of data is accomplished by using the Cache object. This object has a hard dependency on HttpRuntime, which impedes testing. For ASP.NET MVC, if we want to ensure testability, we can t use this static reference. We can access the cache via ControllerContext.HttpContext.Cache, but this class is sealed, so we can t create a mock object for use in tests. This inherent lack of testability is one of the challenges that ASP.NET overcame with version 3.5 SP1. ASP.NET versions 1.0 through 3.5 weren t built with testability in mind. Even though System.Web.Abstractions.dll contains abstract wrappers around so much of the core of ASP.NET, some parts, like caching, are still very concrete. To cope with this, we can wrap the cache in our own interface. Listing 7.2 shows wrapping the cache with an abstraction, and listing 7.3 demonstrates using the ICache interface. Listing 7.4 shows the test.
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Listing 7.2 Wrapping the cache in our own testable interface
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public interface ICache { T Get<T>(string key); void Add(string key, object value);
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Leveraging existing ASP.NET features
bool Exists(string key); } public class AspNetCache : ICache { public T Get<T>(string key) { return (T)HttpContext.Current.Cache[key]; } public void Add(string key, object value) { HttpContext.Current.Cache.Insert(key, value); } public bool Exists(string key) { return HttpContext.Current.Cache.Get(key) != null; } }
Because we ve wrapped the cache in listing 7.2, we re able to use a simplified API and couple our code in listing 7.3 to an abstract cache instead of the ASP.NET cache.
Listing 7.3 Using the cache wrapper in our controllers
private ICache _cache; public HomeController(ICache cache) { _cache = cache; } public ActionResult CacheTest() { const string key = "test"; if(!_cache.Exists(key)) _cache.Add(key, "value"); var message = _cache.Get<string>(key); return Content(message); }
Injects ICache instance
The HomeController in listing 7.3 depends on ICache, but it has no idea about the ASP.NET cache. The controller accepts the cache instance in the constructor B. The unit test for HomeController becomes simple because we can simulate the ICache interface, as shown in listing 7.4.
Listing 7.4 Testing an action that accesses the cache
[Test] public void CacheTest() { var fakeCache = MockRepository.GenerateStub<ICache>(); var controller = new HomeController(fakeCache);
Sets up controller with fake cache
State management
fakeCache.Stub(x => x.Exists("test")).Return(false); controller.CacheTest(); fakeCache.AssertWasCalled(x => x.Add("test", "value")); fakeCache.AssertWasCalled(x => x.Get<string>("test")); }
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